WO2002061265A1 - Soupape de commande de liquides - Google Patents

Soupape de commande de liquides Download PDF

Info

Publication number
WO2002061265A1
WO2002061265A1 PCT/DE2002/000201 DE0200201W WO02061265A1 WO 2002061265 A1 WO2002061265 A1 WO 2002061265A1 DE 0200201 W DE0200201 W DE 0200201W WO 02061265 A1 WO02061265 A1 WO 02061265A1
Authority
WO
WIPO (PCT)
Prior art keywords
valve
hydraulic chamber
throttle
pressure
hydraulic
Prior art date
Application number
PCT/DE2002/000201
Other languages
German (de)
English (en)
Inventor
Patrick Mattes
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2002061265A1 publication Critical patent/WO2002061265A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
    • F02M63/0012—Valves
    • F02M63/0014—Valves characterised by the valve actuating means
    • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
    • F02M63/0026—Valves characterised by the valve actuating means electrical, e.g. using solenoid using piezoelectric or magnetostrictive actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M47/00—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure
    • F02M47/02—Fuel-injection apparatus operated cyclically with fuel-injection valves actuated by fluid pressure of accumulator-injector type, i.e. having fuel pressure of accumulator tending to open, and fuel pressure in other chamber tending to close, injection valves and having means for periodically releasing that closing pressure
    • F02M47/027—Electrically actuated valves draining the chamber to release the closing pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/004—Actuating devices; Operating means; Releasing devices actuated by piezoelectric means
    • F16K31/007—Piezoelectric stacks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • F02M2200/705—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with means for filling or emptying hydraulic chamber, e.g. for compensating clearance or thermal expansion

Definitions

  • the invention is based on a valve for controlling liquids according to the preamble of patent claim 1.
  • Valves for controlling liquids are known from practice, which have a valve member and a hydraulic transmission.
  • the hydraulic transmission usually comprises a hydraulic chamber which has to be filled with liquid to compensate for leakage losses.
  • Such a valve for controlling liquids, in particular fuel in a common rail injector is known from EP 0 477 400 A1.
  • the valve can be actuated via a piezoelectric unit which has at least one piezoelectric actuator and an arrangement for a path transformer of the piezoelectric unit acting in the stroke direction.
  • the deflection of the Ak-. tors transmitted via the hydraulic chamber, which serves as a tolerance compensation element.
  • the hydraulic chamber encloses a common working volume between two pistons delimiting it, of which one piston is designed with a smaller diameter and is connected to a valve closing element to be actuated, and the other piston is designed with a larger diameter and is connected to the piezoelectric actuator.
  • the hydraulic chamber is clamped between the pistons in such a way that the actuating piston makes a stroke that is enlarged by the transmission ratio of the piston diameter when the larger piston is moved by a certain distance by the piezoelectric actuator.
  • tolerances e.g. due to different coefficients of thermal expansion of the materials used and any setting effects can be compensated without the valve closing member experiencing a change in its position.
  • the hydraulic chamber which is located, for example, in a low-pressure area of the valve, requires a system pressure. This system pressure drops due to leaks if there is insufficient refill of liquid.
  • the hydraulic chamber is refilled, for example in the common rail injectors known from practice, by supplying liquid from a high pressure area to the low pressure area of the valve. Frequently, this refilling takes place with the help of leakage gaps that pass through Lick or fill pencils are shown.
  • the system pressure is usually set by a valve, whereby the system pressure can also be kept constant for several common rail valves, for example.
  • the hydraulic chamber is usually filled via a leakage gap which surrounds at least one of the two pistons delimiting the hydraulic chamber and / or the filling pin.
  • the valve according to the invention for controlling liquids with the features of claim 1 has the advantage that due to the direct filling of the hydraulic chamber through a filling channel with a throttle element, negative influences of shape and position tolerances in pistons or pins are eliminated, thus the conflict between the Realization of a large sealing length and the resulting manufacturing effort and the pressure retention capacity of the Hydraulic chamber is released.
  • a stable refilling of the hydraulic chamber is made possible by the use of a throttle element for setting a filling quantity, without one being passed from the valve member to the hydraulic chamber
  • a throttle valve as a throttle element in the filling channel opening into the hydraulic chamber is particularly advantageous.
  • a piston throttle with a throttle cross section in the form of an equilateral triangle can be used as the throttle valve, which can be combined with a check valve, so that a throttle check valve is formed. If the throttle diameter is chosen to be correspondingly small, a throttle check valve can also be omitted.
  • a throttle check valve can also be omitted.
  • other variable throttle cross sections are also possible, so that, for example, adjustable needle throttles can also be used as throttle valves.
  • a diaphragm or a baffle edge can also be used as the throttle element, a circular diaphragm representing an ideal throttle point which is largely independent of viscosity and which is particularly suitable for the shortest possible throttle distances.
  • a venturi tube or a nozzle, etc. can be used.
  • Diameters of the throttle element depend in particular on the pressure difference between the pressure in the hydraulic chamber when opening and the applied high pressure.
  • the filling channel opening into the hydraulic chamber is connected to the high-pressure area of the valve, a constant pressure usually being present during operation. It is also conceivable that the filling channel is fed from another source and can be subjected to variable pressure, for example.
  • FIG. 1 shows a schematic, partial representation of a valve according to the invention for controlling a fuel injection valve for internal combustion engines in longitudinal section
  • FIG. 2 shows several curves of a dynamic force during a pressure surge.
  • FIG. 1 shows a use of the valve according to the invention in a fuel injection valve 1 for internal combustion engines of motor vehicles.
  • the fuel injection valve 1 is designed as a common rail injector for the injection of preferably diesel fuel, the fuel injection via the pressure level in a valve control chamber 2, which is only indicated in FIG. 1 and is connected to a high pressure supply. is controlled.
  • a valve member 3 is actuated via an actuator unit designed as a piezoelectric actuator 4, which is arranged on the side of the valve member 3 facing away from the control chamber and the combustion chamber.
  • the piezoelectric actuator 4 is constructed in the usual manner from several layers and has the valve member 3 facing side an actuator head and on its side facing away from the valve member 3 an actuator base, which is supported on a wall of a valve body 5, not shown.
  • the valve member 3 is axially displaceable in a longitudinal bore 6 of the valve body 5 and, in addition to a first piston 7, which bears on the actuator head and is also referred to as an actuating piston, comprises a second piston 8, which actuates a valve closing member 9 and therefore also is referred to as an actuating piston.
  • the pistons 7 and 8 are coupled to one another by means of a hydraulic transmission, which is designed as a hydraulic chamber 10 and transmits the deflection of the piezoelectric actuator 4.
  • the hydraulic chamber 10 encloses between the two pistons 7 and 8 delimiting it, in which the diameter of the second piston 8 is smaller than the diameter of the first piston 7, a common compensation volume in which a system pressure p_sys prevails.
  • the valve member 3, its pistons 7 and 8 and the piezoelectric actuator 4 preferably lie one behind the other on a common axis, that is to say they are arranged centrally with respect to one another, the second piston 8 making a stroke increased by the ratio of the piston diameter when the larger first piston 7 is moved by the piezoelectric actuator 4 by a certain distance.
  • the pistons 7 and 8 are arranged eccentrically to one another in another embodiment.
  • the compensation volume of the hydraulic chamber 10 allows compensation of tolerances due to temperature gradients in the component or different coefficients of thermal expansion of the materials used, as well as possible setting effects without influencing the position of the valve closing element 9 to be controlled.
  • the ball-like valve closing member 9 interacts with a valve seat 11 formed on the valve body 7, the valve closing member 9 separating a low pressure area from a high pressure area with a high pressure or rail pressure p_Rail.
  • a filling channel 12 is provided, which opens into the hydraulic chamber 10 and is connected here to the high-pressure area of the fuel injection valve 1.
  • a throttle element 13 for setting a filling quantity is provided in the filling channel 12.
  • the device for setting the filling quantity has a throttle valve.
  • Throttle valve 13 can each set a predetermined pressure level in the hydraulic chamber 10 directly and can be kept optimal.
  • FIG. 2 shows a diagram with several courses 14, 15, 16 of a dynamic force F dyn during a pressure surge, ie when the valve member 3 is actuated by the piezoelectric actuator 4.
  • the curve 5 14 of the force F_dyn represents the force characteristic in the fuel injection valve 1 according to the invention.
  • L5 runs in a fuel injector with an eccentric arrangement of the two pistons and also indirect filling of the hydraulic chamber via a leakage gap on one of the pistons.
  • a relatively stable profile 14 of the dynamic force F_dyn in the hydraulic chamber 10 can be achieved. This means that the force of the piezoelectric actuator 4 is optimally transmitted to the valve closing member 9 in the event of a pressure surge.
  • This course 14 can also be influenced by appropriate selection of the throttle element, for example for setting a desired pressure drop. A stable and robust hydraulic transmission ratio is thus made possible in the valve according to the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne une soupape de commande de liquides composée d'un élément de soupape (3) pouvant être déplacé axialement dans un corps de soupape (5), interagissant avec un obturateur de soupape (9) pour l'ouverture et la fermeture de la soupape, et d'une chambre hydraulique (10) servant de transmission hydraulique, pouvant être remplie de liquide pour la compensation de pertes par fuites. Selon l'invention, la chambre hydraulique (10) est reliée directement à au moins un canal de remplissage (12) aboutissant dans une zone haute pression, ledit canal de remplissage présentant au moins un élément d'étranglement (13) destiné à régler une quantité de remplissage de la chambre hydraulique (10).
PCT/DE2002/000201 2001-01-31 2002-01-23 Soupape de commande de liquides WO2002061265A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2001104016 DE10104016A1 (de) 2001-01-31 2001-01-31 Ventil zum Steuern von Flüssigkeiten
DE10104016.4 2001-01-31

Publications (1)

Publication Number Publication Date
WO2002061265A1 true WO2002061265A1 (fr) 2002-08-08

Family

ID=7672149

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2002/000201 WO2002061265A1 (fr) 2001-01-31 2002-01-23 Soupape de commande de liquides

Country Status (2)

Country Link
DE (1) DE10104016A1 (fr)
WO (1) WO2002061265A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1970556A1 (fr) 2007-03-15 2008-09-17 Ford Global Technologies, LLC Injecteur

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4052258B2 (ja) * 2003-05-01 2008-02-27 株式会社デンソー 内燃機関用インジェクタ
DE102005025141B3 (de) * 2005-06-01 2006-09-14 Siemens Ag Ventil
WO2011144642A1 (fr) * 2010-05-17 2011-11-24 Mindray Medical Sweden Ab Vanne à haute pression à commande piézoélectrique et procédé de commande d'une vanne à haute pression
DE102011005428A1 (de) * 2011-03-11 2012-09-13 Robert Bosch Gmbh Verfahren und Vorrichtung zum Wiederbefüllen und Überprüfen der Dichtheit eines Kraftstoffinjektors
DE102014205910A1 (de) 2014-03-31 2015-10-01 Robert Bosch Gmbh Brennstoffeinspritzventil
DE102015207629A1 (de) 2015-04-27 2016-10-27 Robert Bosch Gmbh Einspritzventil für Flüssigkeiten und Verfahren

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0477400A1 (fr) 1990-09-25 1992-04-01 Siemens Aktiengesellschaft Dispositif compensateur de tolérance dans la direction de mouvement du transformateur de déplacement d'un dispositif d'actionnement piézoélectrique
US5209453A (en) * 1989-11-20 1993-05-11 Nippondenso Co., Ltd. Laminated type piezoelectric apparatus
EP0816670A1 (fr) * 1996-07-02 1998-01-07 Siemens Automotive Corporation Injecteur commande par élément piézoélectrique avec amplification de la course
US5875764A (en) * 1998-05-13 1999-03-02 Siemens Aktiengesellschaft Apparatus and method for valve control
DE19844996A1 (de) * 1998-09-30 2000-04-13 Siemens Ag Vorrichtung und Verfahren zur Dosierung von Fluid
US6155532A (en) * 1997-10-02 2000-12-05 Robert Bosch Gmbh Valve for controlling fluids

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5209453A (en) * 1989-11-20 1993-05-11 Nippondenso Co., Ltd. Laminated type piezoelectric apparatus
EP0477400A1 (fr) 1990-09-25 1992-04-01 Siemens Aktiengesellschaft Dispositif compensateur de tolérance dans la direction de mouvement du transformateur de déplacement d'un dispositif d'actionnement piézoélectrique
EP0816670A1 (fr) * 1996-07-02 1998-01-07 Siemens Automotive Corporation Injecteur commande par élément piézoélectrique avec amplification de la course
US6155532A (en) * 1997-10-02 2000-12-05 Robert Bosch Gmbh Valve for controlling fluids
US5875764A (en) * 1998-05-13 1999-03-02 Siemens Aktiengesellschaft Apparatus and method for valve control
DE19844996A1 (de) * 1998-09-30 2000-04-13 Siemens Ag Vorrichtung und Verfahren zur Dosierung von Fluid

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1970556A1 (fr) 2007-03-15 2008-09-17 Ford Global Technologies, LLC Injecteur

Also Published As

Publication number Publication date
DE10104016A1 (de) 2002-08-01

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